I have experienced similar difficulties with wine shipments to China with the Chinese authorities spitting the dummy when documentation from other official sources (other that those they've be used to) is used. Their answer is just to stop the process which can only be started up again with a little lubrication (brown paper bag full of something enticing).
This from a country that:
Counterfeits anything and everything they can;
Poisons its own people regularly;
Poisons pets and people in overseas countries.